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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e4a44b9e598a053b379828cc243b1bab952a882cdbaa8011c80f1d0858bae4' 
  AND token = 'f6OcvKfwdOkJDHAAS2MVCsu2LI6UvEF0O/+rGsl3j7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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