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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb108257eaff6e4f2f1b857c3e3c43a8dfcbb6375d82e25b1d2ba52bf51f5b63' 
  AND token = 'BT0S+qb9pg0u4oy/hDGCzxSa0Z7gez9xfhFuDg61P28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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