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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6367b48139db128beda815fc952a3fb45c031807fde7662c2c8b587f71fa42' 
  AND token = 'xyM2ObT8CP3KhsthkmzPeBUfmS2AN+8crw8kKLt8zgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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