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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f542c5600fa0483c791ffedadce3dccad4e28c9b5e8101d7fae84bcbf1d02c3' 
  AND token = '9gQJAN9Vp6qvUQVVhNQI4LPZHvsdjCC5Y/cEEZFDZqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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