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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2b5031e8c02a3e2e20ea5aa75d1605ac8a29229b45ca80d17bf78c3b0e4c35' 
  AND token = 'g0+xSlwlShvFkzTIQmCXgrmfC4YjoTrUYpCtH8cqShw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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