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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bff759ca62847c043bc7a655a82a64784152ef3c2e7acfc7756f1fcef92ee6e' 
  AND token = 'UhQzITMt4BnrBrI72htpaYU/eos8RSuuigGKB2LtoMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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