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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c11c8b95489e676984de6c71e54961f7921c78743c8dedb37af0ee091c5ccca' 
  AND token = 'RDHsl7jw0oHzdGr1q0LWnYgk812CEF00jVlD35lulvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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