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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfe41f1adca5fab668763d9b8f331f29ec98dccbae71a430d343efc82eae3eb' 
  AND token = 'r+El07tA4TDXO3XRRYwEjRRHZarzFQe7MCSZoG8r/eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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