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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34cdddb88ac9a8405bca1b3eb56e2de889e8c58a9da7d1801b7e0eb73e25708a' 
  AND token = 'bh8qsiDKGSZoRH6cYvNBvPg5pcjzXiN2GrG7eIrA3qE=' 
  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"
    }
  }
}