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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc30b0df2f8b418be8678c4483e68b645f5adc55f27d337174ea857b2837aa5' 
  AND token = 'LV9Dg/GYOOGfZKT+4jyb2Re9Y9wiM+LeTO75/b2Y+RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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