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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1086e6a8dbcad966541a72bedda272925c66e871c52e8242e16eb08c7c3c62db' 
  AND token = 'J1qXw4diaNwOn5uhnTFT/TfqPOPweby40dYe3/yM2gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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