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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c58b506cbf9611a4210d08ba773b52b71322809013987073a5837958ef9f5af' 
  AND token = 'drJCEIXvl1cOWaP2AELKLuz0XZ5hVnbSo0DVVaqW7z0=' 
  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"
    }
  }
}