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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051108ed9f8df22de8b5885a6bee3c97d4b6dfaaab28177ba46cea027c18842a' 
  AND token = 'NLZUPWlq+nq5f2UaMmCebLFZ7EZW1BpoGcp/JxfyH7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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