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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da7961a8bbe98755d8c36e8d85411b0742a87dc396a101f3f3c3b69cc0af8ca' 
  AND token = 'o4IyfmBX/m/buW7rKyTccKTfBvRA8cMxOLyxMG8bFKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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