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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceccb7c7a86ecd2f2a6ec58d5b27ce5ac675966e05bca8cdfa1b75c15b90cd57' 
  AND token = 'mwnxV04VxO4O/3HMxcUqdTJJD4vZ6+HZV1cgEB41s54=' 
  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"
    }
  }
}