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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e073c1d6c40654ab9e15f33798f918f3ff13f78510c79cc7f0a2ff53cce99f' 
  AND token = 'PxgwvdFq3bSWWjG+fm4TaqMP4NAY4UDPMLjeDbfm/k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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