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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20536b0e2daca643b9af0b417c7b96e26bed99e6ae27c42c65ebed2ab0c557b' 
  AND token = 'HP9dT4rOq3qe2x2ThHCFAh5VepNepjfG8QImPqEn1a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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