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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d056e529fc3a0b51772b57d9b74a9fd3c95e26eea8a70ffa7fbd61cdcbe44b' 
  AND token = 'occacQPmtttyKhf1xxAm2oCAm68etzovko4E185/nFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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