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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c14fafc87d9b802249253917dc9dd06036969ce5d2db174bd9b51066b67444' 
  AND token = '9C7pZY0y9vazqWb4Jpze90gqgTITZqz8fnILOiekcVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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