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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc248fc6f9ca518458309dfa8d50e8a453d13689c9fc8d4c359d1ba80be9225' 
  AND token = 'M4L6jVxTYfPf5fZUcy5gCJevoDCyhim8z6EBfJJyngo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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