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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b5401dec364f52eb61e91924e16253cee0986728ccaaf245d450ac18329431' 
  AND token = 'P67AN9By9+s3qg/GD0lrwF+vl8kCRq1WKx2HChAdQcg=' 
  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"
    }
  }
}