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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bccf858c6cc468db0e7e6649043e35951027d84dec203ee28f98bdbe4daacaef' 
  AND token = 'D4c1kZRrqHRVk6w+y9xMVvGP7gChbw82fWMM4G+2jq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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