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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ffe2882e4a1f87576b6ee63a2b79c68389cebb7b3be8f85ea5163060ad2e8ea' 
  AND token = 'I5duAHryOcpj1OyFXG0nk+G9baZeTQfTVELShNIRP6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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