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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08bfee00fc47aaef8461b9124e45adbbd05378ce02890bd147efcf5b838521f6' 
  AND token = 'qr2mCn4xKP3xiMa7uKK6g/qpdCJvI/M7nDxUY0FiYF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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