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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790c6f17befb1cb44697d881af3f7e86d2e79e34ecd108034f1fa7dbe75c7456' 
  AND token = 'kpN1bUH7WAm8s+GhXFgcWIQ3UnDtvH4XVoO3n+u638I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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