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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e592a29ae0c58007ebda673e826fb304ee03a11af102f924f2dee1e413f4247a' 
  AND token = '0FeHZY0BDMXBGsVX34EkXoZFuW/e2GRJtL3hmLy1RbU=' 
  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"
    }
  }
}