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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58b7f7ee1e0ea759e54572c5fb6af59af826186ae9e9c0807bc7a89be92beb1' 
  AND token = 'S4ON03Wqt805fbEqY9EyDqafggUVTJNYAEv5qAlm1a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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