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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3500de76d90f3651971e647f6b1200fd23cd2c6dac7b530a37d043972f95f4a' 
  AND token = 'MrV4IEQRumim3PMpzfGM/RzWl/IljDI7bAd7AhQZ0o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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