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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3016d22595b4b9537409729889457964b3deff25a1abf3da0e1f001e26ac77c' 
  AND token = 'vMUAIE5GkgUL2c0RBAazidux/c+DJv7y/QtmFId5qn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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