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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30d88f9160671c8f629947fb27d9456d55909f9d84fc60e78c3d4ae5ebe45e3' 
  AND token = 'tIb4kSOnjI3G5Cvyih0WhvrqQJqvlENRk26tnoVLYRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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