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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae6dc584a26c0aa4204ec95fade23839f8159d72dc49c253c7c373c43e352a0' 
  AND token = 'jIAeKtMDZTboa3Ll0CY2WbSgHXFCNl2vxyNTJORBgNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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