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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa55ac57159ecfa330a5b2c106c4051d7dadc88d14a1527cec821a7f8546593' 
  AND token = '9nQtJZi+2wbNMLv6/RTEGPNM4BYWsAtpHsuCZ6dr9IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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