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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f1d28f709a0833c66cd3c9271afe3108d2e539f4f9c19fc7672f0c50211008a' 
  AND token = 'zwusnP0AY1QZfrQDeeE86ZeoHlNo0fMdAuLk6/kohPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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