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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f19d20ba33ea2ef67deef37740cc9f559c86d12b4924349435147884e2adfaa' 
  AND token = '3idLsITOl81ON86nJ8+3htXsyWOjqRRokc6G9TRuEAs=' 
  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"
    }
  }
}