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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94f1203cba345125c56a3c8304174b70fd748c24c9c5cd9afeffe8af8cc7bc0' 
  AND token = '/Bip1K4OiTCwj2ahDZGKTxktZ7Mq1upzb/ZTX8m81m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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