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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8c216ab5a88ad93bc99312703ce4902d5d3a5d49ba7f75b1a251faeffe2434' 
  AND token = 'XNZrsgQxxth76ZCzd2NFpMfIaQF8YeIdCmGCKXJS5Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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