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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8fd2fd9b0a120b3d3833e085d8e3289fe236a34aa24f53ba6b131d73cd8e91' 
  AND token = 'B9oonsYYKU1Uvn22CHcMTKC2QY5UxsvSuKALU+Vj1C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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