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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aebe5e2e595fa38d096a3de4076e3b96526b3e7ae31d3ccc1a5eccc288b1b848' 
  AND token = 'OiwtiMUwnmfnRk4k8NBpdE82IezVeFqldwc3ieM4r0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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