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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8797c1046c6fb3fb6a4041e2ee89281f41fab8a15329317ad2ff8a9df38084d' 
  AND token = 'FYFRvCSGYc7cHlTavIwfomuR6AdLOXw7Ve1f8CD3tkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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