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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1765dd698f95c766b008d4d4c6b0c01c4b8a4ef9165411479929362ed52c1db' 
  AND token = 'J1cpzz2uo9JLoY95/NDa0f6gUqopQT/qwGhneeg1pX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}