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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '601bfae17e96b383dafd3762db8df7a45317b7f3eff8b2aae4caf4079aaa5a49' 
  AND token = 'g3pri70SdarrTzcOhjUi1TRsic4Ce/jXCu3ere1vRxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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