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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0daf114fbb0d9d8eb65fe5b2a997e8320c5cbdd5651ecc189a9b99a184070318' 
  AND token = 'e6CASP5RZNmXdBjd3kl6xomE/BKTBaVyaM9zwTincK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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