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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4726f3461a1ff4a586a6f9608f48f20936f3400f4ccbb9562227a40fad23e53' 
  AND token = 'RZCciDV/Hqfv/V702VMGPlJb68WbP6/ryV9N9vheOjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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