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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6975c49502878faed5880ac6ede4b4ca1b7070aa2d2008dbe1ad319fac879f8a' 
  AND token = '82GaCCx0Mpb1U+ENap9nX8WU08ILU1zhVD+bbNE47ik=' 
  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"
    }
  }
}