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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23afeeb67b7273c64d8323a0afdee493ccd7c39b7a22cd2b19e7814c5af179b' 
  AND token = 'eHrzC7/e+hCN1WR8UoGvI0EIeAFTU8O5M9kNzGqhP/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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