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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb7541ba3e2a8536b4b6ad762dc1405ad1580d527d058e87737d4d31a27101c' 
  AND token = 'Xvr/2kiw3QRj0lRb2njnrtgTG1qWmRwO4Un+5PlvYKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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