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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cddfb664f895574c86f62a4a93f50ecb5e8264f39a3f370246355fb347f2117' 
  AND token = 'ltZwV6E8d44vgBw+7IU3/6tKIOqER8mbZcMez0AaFpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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