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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10856d8f6f8527c319a8c7c1683d2f4866f570f364a09d40cbc6a1bdf73cf59f' 
  AND token = 'NnD90HaDlPJZg3cOqfjfULFc1L/xuDqGYUCky9xdwHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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