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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1630576cd886c1af99554f774c0e7cfe5ae94a75eecce104d43a99d1eee2f13' 
  AND token = '55c/TSCvIdXyy+x9MzBSalv7cXYeEsbK6WG8yjfHmZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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