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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae913e53c0cc750f188e1d7e161b230ae120f12622fc03293ab9ba3d292629c' 
  AND token = 'vj1Kwmn66NwcdsLDPjQvEFDU8wNu+D2wVEHBv1eh7C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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