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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5844dc85f020ead84d2816c678b5d060d644892871cd3e1d1f17469d29703e71' 
  AND token = 'EVwJ/HB13JIrRzlL/ai0BQcG2aL5v/aLhhKzhORUiNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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