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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f90c09c44362fc99347622b5a273b39a5321abf8c7c334fb77eda62f3abb4fe' 
  AND token = '1ShUObh/KDym89LlXTjLnYcB4P3DGtWXh4W0Zf8Z/QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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