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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2fe39a7e4fb5dea1cbcaee3016beb2a65d8065031efedd6781deafa4d916df2' 
  AND token = 'ABh6ojdVfxZOxb61a4Hqo2/LmBvAyxxf20xOQKtY2gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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