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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57122278938e5c9df14091d772384b3ea1829e3666c5f6152e7e8d6d997bfb8d' 
  AND token = 'aByBcl80SWl8yR38C+I72nxOhbKz2PwGtx2bw1CykJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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