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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05dfc6350cb77c867a1a3fe462d0007070594a1425688ba25ec71459c68148f0' 
  AND token = 'kP7URfsqI8/VME7n9paYZ9qO9UnDf5chOKSGSZYbEEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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