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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6dcd445e26d0f43ceb6fadc68c09f737a649da5b2855a75a5a7832e9506ab6a' 
  AND token = '8fhVzuHh0ft/52j4STYC3WCVckYjGRJ+NqDWqC86kTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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